<?php

/**
 * 图片处理类，用于完成图片缩放，水印添加
 * 当水印图超过目标图片尺寸时，水印图能自动适应目标图片而缩小
 * 水印图可以设置透明度
 *
 * Example Usage:
 *
 * 自动裁切:程序会按照图片的尺寸从中部裁切最大的正方形，并按目标尺寸进行缩略
 * <code>
 * $t->setSrcImg("img/test.jpg");
 * $t->setCutType(1);//这一句就OK了
 * $t->setDstImg("tmp/new_test.jpg");
 * $t->createImg(60,60);
 * </code>
 *
 * 手工裁切:程序会按照指定的位置从源图上取图
 * <code>
 * $t->setSrcImg("img/test.jpg");
 * $t->setCutType(2);//指明为手工裁切
 * $t->setSrcCutPosition(100, 100);// 源图起点坐标
 * $t->setRectangleCut(300, 200);// 裁切尺寸
 * $t->setDstImg("tmp/new_test.jpg");
 * $t->createImg(300,200);
 * </code>
 */
class cb_image {

    public $dst_img; // 目标文件
    private $h_src; // 图片资源句柄
    private $h_dst; // 新图句柄
    private $h_mask; // 水印句柄
    public $img_create_quality = 100; // 图片生成质量
    public $img_display_quality = 80; // 图片显示质量,默认为75
    public $img_scale = 0; // 图片缩放比例
    public $src_w = 0; // 原图宽度
    public $src_h = 0; // 原图高度
    public $dst_w = 0; // 新图总宽度
    public $dst_h = 0; // 新图总高度
    public $fill_w; // 填充图形宽
    public $fill_h; // 填充图形高
    public $copy_w; // 拷贝图形宽
    public $copy_h; // 拷贝图形高
    public $src_x = 0; // 原图绘制起始横坐标
    public $src_y = 0; // 原图绘制起始纵坐标
    public $start_x; // 新图绘制起始横坐标
    public $start_y; // 新图绘制起始纵坐标
    public $mask_type = 0; //水印类型 0-禁用 1-文字水印 2-图片水印
    public $mask_minwidth; //小于此尺寸的图片附件将不添加水印，0 以水印图片大小为添加条件
    public $mask_minheight; //小于此尺寸的图片附件将不添加水印，0 以水印图片大小为添加条件
    public $mask_word; // 水印文字
    public $mask_img; // 水印图片
    public $mask_pos_x = 0; // 水印横坐标
    public $mask_pos_y = 0; // 水印纵坐标
    public $mask_offset_x = 10; // 水印横向偏移
    public $mask_offset_y = 10; // 水印纵向偏移
    public $font_w; // 水印字体宽
    public $font_h; // 水印字体高
    public $mask_w; // 水印宽
    public $mask_h; // 水印高
    public $mask_font_color = "#ffffff"; // 水印文字颜色
    public $font = 2; // 水印字体
    public $font_size = 12; // 尺寸
    public $mask_position = 0; // 水印位置
    public $mask_img_pct = 50; // 图片合并程度,值越大，合并程序越低
    public $mask_txt_pct = 50; // 文字合并程度,值越小，合并程序越低
    public $img_border_size = 0; // 图片边框尺寸
    public $img_border_color; // 图片边框颜色
    public $_flip_x = 0; // 水平翻转次数
    public $_flip_y = 0; // 垂直翻转次数
    public $cut_type = 0; // 剪切类型
    public $img_type; // 文件类型
    private $error = array(); //错误信息
    // 文件类型定义,并指出了输出图片的函数
    public $all_type = array("jpg" => array("output" => "imagejpeg"),
        "gif" => array("output" => "imagegif"),
        "png" => array("output" => "imagepng"),
        "wbmp" => array("output" => "image2wbmp"),
        "jpeg" => array("output" => "imagejpeg")
    );

    /**
     * 构造函数
     */
    public function __construct() {
        //$this->mask_font_color = "#ffffff";
        //$this->font = 2;
        //$this->font_size = 12;
    }

    /**
     * 取得图片的宽
     */
    public function getImgWidth($src) {
        return imagesx($src);
    }

    /**
     * 取得图片的高
     */
    public function getImgHeight($src) {
        return imagesy($src);
    }

    /**
     * 设置图片生成路径
     *
     * @param string $src_img 图片生成路径
     */
    public function setSrcImg($src_img, $img_type = null) {
        if (!file_exists($src_img)) {
            $this->error [] = "图片不存在";
            return false;
        }

        if (!empty($img_type)) {
            $this->img_type = $img_type;
        } else {
            $this->img_type = $this->_getImgType($src_img);
        }

        $this->_checkValid($this->img_type);

        $src = '';
        if (function_exists("file_get_contents")) {
            $src = file_get_contents($src_img);
        } else {
            $handle = fopen($src_img, "r");
            while (!feof($handle)) {
                $src .= fgets($handle, 4096);
            }
            fclose($handle);
        }
        if (empty($src)) {
            $this->error [] = "图片源为空";
            return false;
        }
        $this->h_src = @ImageCreateFromString($src);
        $this->src_w = $this->getImgWidth($this->h_src);
        $this->src_h = $this->getImgHeight($this->h_src);
    }

    /**
     * 设置图片生成路径
     *
     * @param string $dst_img 图片生成路径
     */
    public function setDstImg($dst_img) {
        $arr = explode('/', $dst_img);
        $last = array_pop($arr);
        $path = implode('/', $arr);
        $this->_mkdirs($path);
        $this->dst_img = $dst_img;
    }

    /**
     * 设置图片的显示质量
     *
     * @param string $n 质量
     */
    public function setImgDisplayQuality($n) {
        $this->img_display_quality = (int) $n;
    }

    /**
     * 设置图片的生成质量
     *
     * @param string $n 质量
     */
    public function setImgCreateQuality($n) {
        $this->img_create_quality = (int) $n;
    }

    /**
     * 设置水印类型 
     * @param int $type 水印类型 0-禁用 1-文字水印 2-图片水印
     */
    public function setMaskType($type) {
        if (!in_array($type, array(0, 1, 2))) {
            $type = 0;
        }
        $this->mask_type = $type;
    }

    /**
     * 设置文字水印
     *
     * @param string $word 水印文字
     * @param integer $font 水印字体
     * @param string $color 水印字体颜色
     */
    public function setMaskWord($word) {
        $this->mask_word .= $word;
    }

    /**
     * 设置字体颜色
     *
     * @param string $color 字体颜色
     */
    public function setMaskFontColor($color = "#ffffff") {
        $this->mask_font_color = $color;
    }

    /**
     * 设置水印字体
     *
     * @param string|integer $font 字体
     */
    public function setMaskFont($font) {
        if (!file_exists($font)) {
            $this->error [] = "字体文件不存在";
            return false;
        }
        $this->font = $font;
    }

    /**
     * 设置文字字体大小,仅对truetype字体有效
     */
    public function setMaskFontSize($size = "12") {
        $this->font_size = $size;
    }

    /**
     * 设置图片水印
     *
     * @param string $img 水印图片源
     */
    public function setMaskImg($img) {
        $this->mask_img = $img;
    }

    /**
     * 设置水印横向偏移
     *
     * @param integer $x 横向偏移量
     */
    public function setMaskOffsetX($x) {
        $this->mask_offset_x = (int) $x;
    }

    /**
     * 设置水印纵向偏移
     *
     * @param integer $y 纵向偏移量
     */
    public function setMaskOffsetY($y) {
        $this->mask_offset_y = (int) $y;
    }

    /**
     * 指定水印位置
     *
     * @param integer $position 位置,1:左上,2:左下,3:右上,0/4:右下
     */
    public function setMaskPosition($position = 0) {
        $this->mask_position = (int) $position;
    }

    /**
     * 设置图片合并程度
     *
     * @param integer $n 合并程度
     */
    public function setMaskImgPct($n) {
        $this->mask_img_pct = (int) $n;
    }

    /**
     * 设置文字合并程度
     *
     * @param integer $n 合并程度
     */
    public function setMaskTxtPct($n) {
        $this->mask_txt_pct = (int) $n;
    }

    /**
     * 设置缩略图边框
     */
    public function setDstImgBorder($size = 1, $color = "#000000") {
        $this->img_border_size = (int) $size;
        $this->img_border_color = $color;
    }

    /**
     * 水平翻转
     */
    public function flipH() {
        $this->_flip_x++;
    }

    /**
     * 垂直翻转
     */
    public function flipV() {
        $this->_flip_y++;
    }

    /**
     * 设置剪切类型
     */
    public function setCutType($type) {
        $this->cut_type = (int) $type;
    }

    /**
     * 设置图片剪切大小
     *
     * @param integer $width 矩形剪切大小
     */
    public function setRectangleCut($width, $height) {
        $this->fill_w = (int) $width;
        $this->fill_h = (int) $height;
    }

    /**
     * 设置源图剪切起始坐标点
     */
    public function setSrcCutPosition($x, $y) {
        $this->src_x = (int) $x;
        $this->src_y = (int) $y;
    }

    /**
     * 设置源图剪切大小
     */
    public function setSrcCut($w, $h) {
        $this->copy_w = (int) $w;
        $this->copy_h = (int) $h;
    }

    /**
     * 创建图片,主函数
     * @param integer $a 当缺少第二个参数时，此参数将用作百分比， 否则作为宽度值
     * @param integer $b 图片缩放后的高度
     */
    public function createImg($a, $b = null) {
        $num = func_num_args ();
        if (1 == $num) {
            $r = (int) $a;
            if ($r < 1) {
                $this->error [] = "图片缩放比例不得小于1";
                return false;
            }
            $this->img_scale = $r;
            $this->_setNewImgSize($r);
        }

        if (2 == $num) {
            $w = (int) $a;
            $h = (int) $b;
            if (0 == $w) {
                $this->error [] = "目标宽度不能为0";
                return false;
            }
            if (0 == $h) {
                $this->error [] = "目标高度不能为0";
                return false;
            }
            $this->_setNewImgSize($w, $h);
        }

        if ($this->_flip_x % 2 != 0) {
            $this->_flipH($this->h_src);
        }

        if ($this->_flip_y % 2 != 0) {
            $this->_flipV($this->h_src);
        }
        $this->_createMask();
        $this->_output();

        // 释放
        if (/* imagedestroy ( $this->h_src )&& */ imagedestroy($this->h_dst)) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 生成水印,调用了生成水印文字和水印图片两个方法
     */
    private function _createMask() {
        if (($this->mask_minwidth != 0 && $this->src_w < $this->mask_minwidth) || ($this->mask_minheight != 0 && $this->src_h < $this->mask_minheight)) {//不符合设定的添加水印条件
            $this->mask_type = 0;
        }
        if ($this->mask_type == 0) {
            $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
            $white = ImageColorAllocate($this->h_dst, 255, 255, 255);
            imagefilledrectangle($this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white); // 填充背景色
            $this->_drawBorder();
            imagecopyresampled($this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h);
        }
        if ($this->mask_type == 1) {
            // 获取字体信息
            $this->_setFontInfo();

            if ($this->_isFull()) {
                $this->error [] = "水印文字过大";
                return false;
            } else {
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                $white = ImageColorAllocate($this->h_dst, 255, 255, 255);
                imagefilledrectangle($this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white); // 填充背景色
                $this->_drawBorder();
                imagecopyresampled($this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h);
                $this->_createMaskWord($this->h_dst);
            }
        }

        if ($this->mask_type == 2) {
            $this->_loadMaskImg(); //加载时，取得宽高
            if ($this->_isFull()) {
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                $white = ImageColorAllocate($this->h_dst, 255, 255, 255);
                imagefilledrectangle($this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white); // 填充背景色
                $this->_drawBorder();
                imagecopyresampled($this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->start_y, $this->copy_w, $this->copy_h);
                $this->_createMaskImg($this->h_dst);
            } else {
                // 创建新图并拷贝
                $this->h_dst = imagecreatetruecolor($this->dst_w, $this->dst_h);
                $white = ImageColorAllocate($this->h_dst, 255, 255, 255);
                imagefilledrectangle($this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white); // 填充背景色
                $this->_drawBorder();
                imagecopyresampled($this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h);
                $this->_createMaskImg($this->h_dst);
            }
        }
    }

    /**
     * 画边框
     */
    private function _drawBorder() {
        if (!empty($this->img_border_size)) {
            $c = $this->_parseColor($this->img_border_color);
            $color = ImageColorAllocate($this->h_src, $c [0], $c [1], $c [2]);
            imagefilledrectangle($this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $color); // 填充背景色
        }
    }

    /**
     * 生成水印文字
     */
    private function _createMaskWord($src) {
        $this->_countMaskPos();
        $this->_checkMaskValid();
        $c = $this->_parseColor($this->mask_font_color);
        $color = imagecolorallocatealpha($src, $c [0], $c [1], $c [2], $this->mask_txt_pct);

        if (is_numeric($this->font)) {
            imagestring($src, $this->font, $this->mask_pos_x, $this->mask_pos_y, $this->mask_word, $color);
        } else {
            imagettftext($src, $this->font_size, 0, $this->mask_pos_x, $this->mask_pos_y + $this->mask_h, $color, $this->font, $this->mask_word);
        }
    }

    /**
     * 生成水印图
     */
    private function _createMaskImg($src) {
        $this->_countMaskPos();
        $this->_checkMaskValid();
        imagecopymerge($src, $this->h_mask, $this->mask_pos_x, $this->mask_pos_y, 0, 0, $this->mask_w, $this->mask_h, $this->mask_img_pct);
        imagedestroy($this->h_mask);
    }

    /**
     * 加载水印图
     */
    private function _loadMaskImg() {
        if (empty($this->mask_img)) {
            $this->error [] = "水印图片不存在";
            return false;
        }
        $mask_type = $this->_getImgType($this->mask_img);
        $this->_checkValid($mask_type);

        $src = '';
        if (function_exists("file_get_contents")) {
            $src = file_get_contents($this->mask_img);
        } else {
            $handle = fopen($this->mask_img, "r");
            while (!feof($handle)) {
                $src .= fgets($handle, 4096);
            }
            fclose($handle);
        }
        if (empty($src)) {
            $this->error [] = "水印图片为空";
            return false;
        }
        $this->h_mask = imagecreatefromstring($src);
        $this->mask_w = $this->getImgWidth($this->h_mask);
        $this->mask_h = $this->getImgHeight($this->h_mask);
    }

    /**
     * 图片输出
     */
    private function _output() {
        $img_type = $this->img_type;
        $func_name = $this->all_type [$img_type] ['output'];
        if (function_exists($func_name)) {
            // 判断浏览器,若是IE就不发送头
            if (isset($_SERVER ['HTTP_USER_AGENT'])) {
                $ua = strtoupper($_SERVER ['HTTP_USER_AGENT']);
                if (!preg_match('/^.*MSIE.*\)$/i', $ua)) {
                    //header("Content-type:$img_type");
                }
            }
            $func_name($this->h_dst, $this->dst_img, $this->img_display_quality);
        } else {
            return false;
        }
    }

    /**
     * 分析颜色
     *
     * @param string $color 十六进制颜色
     */
    private function _parseColor($color) {
        $arr = array();
        for ($ii = 1; $ii < strlen($color); $ii++) {
            $arr [] = hexdec(substr($color, $ii, 2));
            $ii++;
        }

        return $arr;
    }

    /**
     * 计算出位置坐标
     */
    private function _countMaskPos() {
        if ($this->mask_position == 0) {
            $this->mask_position = rand(1, 9);
        }
        if ($this->_isFull()) {
            switch ($this->mask_position) {
                case 1 :
                    // 上左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;

                case 2 :
                    // 上中
                    $this->mask_pos_x = ($this->src_w - $this->mask_w - $this->mask_offset_x) / 2;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;

                case 3 :
                    // 上右
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;

                case 4 :
                    // 中左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = ($this->src_h - $this->mask_offset_y - $this->mask_h) / 2;
                    break;

                case 5 :
                    // 中中
                    $this->mask_pos_x = ($this->src_w - $this->mask_w - $this->mask_offset_x) / 2;
                    $this->mask_pos_y = ($this->src_h - $this->mask_offset_y - $this->mask_h) / 2;
                    break;

                case 6 :
                    // 中右
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                    $this->mask_pos_y = ($this->src_h - $this->mask_offset_y - $this->mask_h) / 2;
                    break;

                case 7 :
                    // 下左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = $this->src_h - $this->mask_offset_y - $this->mask_h;
                    break;

                case 8 :
                    // 下中
                    $this->mask_pos_x = ($this->src_w - $this->mask_w - $this->mask_offset_x) / 2;
                    $this->mask_pos_y = $this->src_h - $this->mask_offset_y - $this->mask_h;
                    break;

                case 9 :
                    // 下右
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                    $this->mask_pos_y = $this->src_h - $this->mask_offset_y - $this->mask_h;
                    break;

                default :
                    // 默认将水印放到右下,偏移指定像素
                    $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                    $this->mask_pos_y = $this->src_h - $this->mask_offset_y - $this->mask_h;
                    break;
            }
        } else {
            switch ($this->mask_position) {
                case 1 :
                    // 上左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;
                case 2 :
                    // 上中
                    $this->mask_pos_x = ($this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size) / 2;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;

                case 3 :
                    // 上右
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                    $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                    break;

                case 4 :
                    // 中左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = ($this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size) / 2;
                    break;

                case 5 :
                    // 中中
                    $this->mask_pos_x = ($this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size) / 2;
                    $this->mask_pos_y = ($this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size) / 2;
                    break;

                case 6:
                    // 中右
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                    $this->mask_pos_y = ($this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size) / 2;
                    break;

                case 7 :
                    // 下左
                    $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                    $this->mask_pos_y = $this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size;
                    break;

                case 8 :
                    // 下中
                    $this->mask_pos_x = ($this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size) / 2;
                    $this->mask_pos_y = $this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size;
                    break;

                case 9 :
                    // 下右
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                    $this->mask_pos_y = $this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size;
                    break;

                default :
                    // 默认将水印放到右下,偏移指定像素
                    $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                    $this->mask_pos_y = $this->dst_h - $this->mask_offset_y - $this->mask_h - $this->img_border_size;
                    break;
            }
        }
    }

    /**
     * 设置字体信息
     */
    private function _setFontInfo() {
        if (is_numeric($this->font)) {
            $this->font_w = imagefontwidth($this->font);
            $this->font_h = imagefontheight($this->font);

            // 计算水印字体所占宽高
            $word_length = strlen($this->mask_word);
            $this->mask_w = $this->font_w * $word_length;
            $this->mask_h = $this->font_h;
        } else {
            $arr = imagettfbbox($this->font_size, 0, $this->font, $this->mask_word);
            $this->mask_w = abs($arr [0] - $arr [2]);
            $this->mask_h = abs($arr [7] - $arr [1]);
        }
    }

    /**
     * 设置新图尺寸
     *
     * @param integer $img_w 目标宽度
     * @param integer $img_h 目标高度
     */
    private function _setNewImgSize($img_w, $img_h = null) {
        $num = func_num_args ();
        if (1 == $num) {
            $this->img_scale = $img_w; // 宽度作为比例
            $this->fill_w = round($this->src_w * $this->img_scale / 100) - $this->img_border_size * 2;
            $this->fill_h = round($this->src_h * $this->img_scale / 100) - $this->img_border_size * 2;

            // 源文件起始坐标
            $this->src_x = 0;
            $this->src_y = 0;
            $this->copy_w = $this->src_w;
            $this->copy_h = $this->src_h;

            // 目标尺寸
            $this->dst_w = $this->fill_w + $this->img_border_size * 2;
            $this->dst_h = $this->fill_h + $this->img_border_size * 2;
        }

        if (2 == $num) {
            $fill_w = (int) $img_w - $this->img_border_size * 2;
            $fill_h = (int) $img_h - $this->img_border_size * 2;
            if ($fill_w < 0 || $fill_h < 0) {
                $this->error [] = "图片边框过大，已超过了图片的宽度";
                return false;
            }
            $rate_w = $this->src_w / $fill_w;
            $rate_h = $this->src_h / $fill_h;

            switch ($this->cut_type) {
                case '0' :
                    // 如果原图大于缩略图，产生缩小，否则不缩小
                    if ($rate_w < 1 && $rate_h < 1) {
                        $this->fill_w = (int) $this->src_w;
                        $this->fill_h = (int) $this->src_h;
                    } else {
                        if ($rate_w >= $rate_h) {
                            $this->fill_w = (int) $fill_w;
                            $this->fill_h = round($this->src_h / $rate_w);
                        } else {
                            $this->fill_w = round($this->src_w / $rate_h);
                            $this->fill_h = (int) $fill_h;
                        }
                    }

                    $this->src_x = 0;
                    $this->src_y = 0;

                    $this->copy_w = $this->src_w;
                    $this->copy_h = $this->src_h;

                    // 目标尺寸
                    $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                    $this->dst_h = $this->fill_h + $this->img_border_size * 2;
                    break;

                // 自动裁切
                case '1' :
                    // 如果图片是缩小剪切才进行操作
                    if ($rate_w >= 1 && $rate_h >= 1) {
                        if ($this->src_w > $this->src_h) {
                            $src_x = round($this->src_w - $this->src_h) / 2;
                            $this->setSrcCutPosition($src_x, 0);
                            $this->setRectangleCut($fill_h, $fill_h);

                            $this->copy_w = $this->src_h;
                            $this->copy_h = $this->src_h;
                        } elseif ($this->src_w < $this->src_h) {
                            $src_y = round($this->src_h - $this->src_w) / 2;
                            $this->setSrcCutPosition(0, $src_y);
                            $this->setRectangleCut($fill_w, $fill_h);

                            $this->copy_w = $this->src_w;
                            $this->copy_h = $this->src_w;
                        } else {
                            $this->setSrcCutPosition(0, 0);
                            $this->copy_w = $this->src_w;
                            $this->copy_h = $this->src_w;
                            $this->setRectangleCut($fill_w, $fill_h);
                        }
                    } else {
                        $this->setSrcCutPosition(0, 0);
                        $this->setRectangleCut($this->src_w, $this->src_h);

                        $this->copy_w = $this->src_w;
                        $this->copy_h = $this->src_h;
                    }

                    // 目标尺寸
                    $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                    $this->dst_h = $this->fill_h + $this->img_border_size * 2;

                    break;

                // 手工裁切
                case '2' :
                    $this->fill_w = $fill_w;
                    $this->fill_h = $fill_h;
                    if (!$this->copy_w) {
                        $this->copy_w = $this->fill_w;
                    }
                    if (!$this->copy_h) {
                        $this->copy_h = $this->fill_h;
                    }

                    // 目标尺寸
                    $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                    $this->dst_h = $this->fill_h + $this->img_border_size * 2;

                    break;
                default :
                    break;
            }
        }
        if ($this->copy_w > $this->src_w) {
            $this->copy_w > $this->src_w;
        }
        if ($this->copy_h > $this->src_h) {
            $this->copy_h > $this->src_h;
        }

        // 目标文件起始坐标
        $this->start_x = $this->img_border_size;
        $this->start_y = $this->img_border_size;
    }

    /**
     * 检查水印图是否大于生成后的图片宽高
     */
    private function _isFull() {
        return ($this->mask_w + $this->mask_offset_x > $this->fill_w || $this->mask_h + $this->mask_offset_y > $this->fill_h) ? true : false;
    }

    /**
     * 检查水印图是否超过原图
     */
    public function _checkMaskValid() {
        if ($this->mask_w + $this->mask_offset_x > $this->src_w || $this->mask_h + $this->mask_offset_y > $this->src_h) {
            $this->error [] = "水印图片尺寸大于原图，请缩小水印图";
            return false;
        }
    }

    /**
     * 取得图片类型
     *
     * @param string $file_path 文件路径
     */
    private function _getImgType($file_path) {
        $type_list = array("1" => "gif", "2" => "jpg", "3" => "png", "4" => "swf", "5" => "psd", "6" => "bmp", "15" => "wbmp");
        if (file_exists($file_path)) {
            $img_info = @getimagesize($file_path);
            if (isset($type_list [$img_info [2]])) {
                return $type_list [$img_info [2]];
            }
        } else {
            $this->error [] = "文件不存在,不能取得文件类型!";
            return false;
        }
    }

    /**
     * 检查图片类型是否合法,调用了array_key_exists函数
     *
     * @param string $img_type 文件类型
     */
    private function _checkValid($img_type) {
        if (!array_key_exists($img_type, $this->all_type)) {
            return false;
        }
        return true;
    }

    /**
     * 按指定路径生成目录
     *
     * @param string $path 路径
     */
    private function _mkdirs($path) {
        $adir = explode('/', $path);
        $dirlist = '';
        $rootdir = array_shift($adir);
        if (($rootdir != '.' || $rootdir != '..') && !file_exists($rootdir)) {
            @mkdir($rootdir);
        }
        foreach ($adir as $key => $val) {
            if ($val != '.' && $val != '..') {
                $dirlist .= "/" . $val;
                $dirpath = $rootdir . $dirlist;
                if (!file_exists($dirpath)) {
                    @mkdir($dirpath);
                    @chmod($dirpath, 0777);
                }
            }
        }
    }

    /**
     * 垂直翻转
     *
     * @param string $src 图片源
     */
    private function _flipV($src) {
        $src_x = $this->getImgWidth($src);
        $src_y = $this->getImgHeight($src);

        $new_im = imagecreatetruecolor($src_x, $src_y);
        for ($y = 0; $y < $src_y; $y++) {
            imagecopy($new_im, $src, 0, $src_y - $y - 1, 0, $y, $src_x, 1);
        }
        $this->h_src = $new_im;
    }

    /**
     * 水平翻转
     *
     * @param string $src 图片源
     */
    private function _flipH($src) {
        $src_x = $this->getImgWidth($src);
        $src_y = $this->getImgHeight($src);

        $new_im = imagecreatetruecolor($src_x, $src_y);
        for ($x = 0; $x < $src_x; $x++) {
            imagecopy($new_im, $src, $src_x - $x - 1, 0, $x, 0, 1, $src_y);
        }
        $this->h_src = $new_im;
    }

    /**
     * 返回错误信息
     * @return multitype:
     */
    public function getErrors() {
        return $this->error;
    }

}